Wuihelm von siemens



W. VON SIEMENS.

TYPE WRITER.

APPLICATION FILED Nov.26. I915.

Patented Sept. 30,1919.

w e nu magma Av L ft - UNITED STATES PATENT OFFICE.

WILHELM vox SIEMENS, 0F CHARLOTTENBURG, NEAR BERLIN, GERMANY, ASSIGNOR Tb SIEMENS & HALSKE, AKTIENGESELLSGHAFT, 0F BERLIN, GERMANY, A CORPORA- TION OF GERMANY.

TYPE-WRITER.

To all whom it may concern:

Be it known that I, WILHELM VON Sm- MnNs, a citizen of the German Empire, and residing at Charlottenburg, near Berlin, Germany, have invented certain new and useful Improvements in Type-Writers, of which the following is a specification.

This invention relates to typewriters, and a primary object is to provide an improved typewriter adapted to produce prmted matter of a good quality at a very high speed.

To th1s end, in the improvedtypewriter type images are thrown by means of stationary templets onto a surface sensitive to light. The time which each image lasts may be so short that the Sensitive surface onto which the type images are thrown may move continuously and need not be stopped at all. In this case the sensitive surface will move at a uniform speed during the production of a whole line, and the jerks which are otherwise produced by stopping the heavy paper carriage are avoided;

Another object is to provide that each letter may be produced at a center-distance from the last previously printed letter corresponding to its characteristic breadth. To this end, the images are produced at various intervals of time, so that for example, abroad image is thrown onto the sensitive surface only when the latter has been fed a distance corresponding to its breadth. In

order that each image of a type may be produced at the correct moment the exposures are controlled in the improved typewriter by a register band. This enables printed matter to be produced at a speed which cannot be attained by a manual operator however dextrous.

To these and other ends the invention consists in the construction, arrangement and combination of parts described hereinafter and pointed out in the claims.

One illustrative embodiment of the invention is diagrammatically represented by way of example in the accompanying drawing, wherein Figure 1 is a diagram showing the general arrangement of the s ark gaps, lenses and screen provided wit type templets and suitably related to the material to be printed upon;

Fig. 2 shows means'for making the movement of the sensitive surface dependent on that of the register band;

Specification of Letters Patent. Patented Sept, 30, 1919 Application filed November 26, 1915. Serial No. 63,569.

gig. 3 shows a portion of a register band, an

Fig. 4 is a diagram showing means for recharging the condensers.

Referring to Fig. 1, the material 1 to be printed upon, e. 9., sensitized paper, is wound about the platen 32 of the paper-carriage 33. Type templets 2 are arranged in the screen 3 located behind the platen, and behind each templet is arranged a spark gap 4:; the light from these spark gaps is thrown by the lenses 5 and 6 and the prisms 7 onto the same point in the path of movement of the sensitive surface.

The operation of the spark gaps is controlled by a register band such as that represented in Fig. 3. The illustrative embodifor each type. The round guide holes 12 are I for holding the register band in place and for feeding it. The band 9 runs over a contact block 10 (Figs. 1 and 2), on which nine contact springs 11 bear. When one of the square holes 13 passes under one of the contact springsthe following circuit in-Fig.

a spark gap 4, a contact sprin 11, the contact block 10 and the other p0 e of the condenser. The condenser discharges and produces in the spark gap a spark which throws an instantaneous image of the type onto the sensitive surface 1.

The movement of the sensitive surface 1 and that of the register band 9 are dependent on one another. As shown in Fig. 2, the band 9 is wound on a roller 17 A guide roll 16 carrying pins 16 which take into the holes 12 feeds the band between the contact block 10 and the springs 11; a roller 18 winds the band up. The guide roll 16 is geared by means of the gear wheel 15 with the toothed rack 14 of the paper carriage 33 on which the platen 32 is mounted. The sensitive surface 1 carried by the paper carriage and the register band consequently move at speeds proportional to one another.

The holes 13 of the register band are various distances apart in the longitudinal direc tion, as Fig. 3 shows. For example, the first two holes 13 are just as far apart as two '85 1 is closed, viz :one -pole of a condenser 8,

guide holes 12; the third hole 13, however, is located at only one half the distance, and so on. Consequently, a correspondingly long time will elapse until the second perforation 13 will allow a spark to jump across a spark gap 4, and during this time the paper carriage 32 can move forward as far as is requisite for printing a broad type. When the distance of each perforation 13 from the previous one in the band corresponds to the desired breadth of the type on the surface to be printed upon, printing is produced in which the letters are spaced as in the letterpress of books.

Fig. 4 shows one form of apparatus for recharging a condenser. The circuit runs from one pole of the condenser 8 over the spark gap 4, the contact spring 11, the contact block 10 and then through a magnet 22 to the other pole of the condenser 8. As soon as the spring 11 closes the circuit the magnet 22 attracts the pawl 28 and rocks it into its outer position, this pawl being normally held in its inner position by the spring 29. The stop 27 on a disk 23 is thereby released by the pawl. The disk 23 is under the action of a tensioned spring 24, and whenever the electromagnet 22 is energized for a short time the disk 23 can rotate once. Thereby a contact piece 25 on the disk passes under two stationary springs 26 hearing on the disk 23, whereby the following charging circuit is closed, viz: one pole of the battery 21, the springs 26, the contact piece 25, the condenser 8 and the other pole of the battery 21. The time taken by the contact piece 25 to move as far as the springs 26 is made such that in the meantime the next perforated symbol 13 has moved forward underits contact spring 11.

The type templets 2 can be constituted simply by a photographic negative of the types. This is cheap to manufacture and the type templets can be readily and rapidly exchanged for others of different design.

Havin thus described in the foregoing some em odiments of my invention, I do not wish to be understood as limiting myself to the precise constructions as shown, since modifications may be made therein without departing from the principle or sacrificing any of the advantages of this invention. I therefore claim as new and desire to secure by Letters Patent of the United States 1. In a machine of the character described in combination, a plurality of stationary type templets, means for moving a surface sensitive to light relatively to the said templets, and means for selectively throwing images of the individual types upon the said sensitive surface.

2. In a machine of the character described in combination, a plurality of stationary type templets, means for moving a surface sensitive to light at a uniform speed relatively to the said templets and means for selectively throwing images of the individual types upon the said sensitive surface.

3. In a machine of the character described in combination, a plurality of stationary type templets, means for imparting to a surface sensitive to light a continuous uniform motion relatively to the said templets, and means for selectively throwing images of the individual types upon the said sensitive surface at intervals varying in accordance with the breadth of each type.

4. In a machine of the character described in combination, a plurality of stationary type templets, means for imparting to a surface sensitive to light a continuous uniform motion relatively to the said templets, means for selectively throwing light through the said templets and means for producing by such light images of the individual types on the sensitive surface.

5. In a machine of the character described in combination, a plurality of stationary type templets, means for imparting to a surface sensitive to light a continuous uniform motion relatively to the said templets, means for selectively throwing light through the said templets at intervals varying in accordance with the breadth of each type, and means for producing by such light images of the individual types on the sensitive surface.

6. In a machine of the character described in combination, a plurality of stationary type templets, means for imparting to a surface sensitive to light a continuous uniform motion relatively to the said templets, electrical means associated with'said templets for selectively throwing instantaneous light through the same at intervals varying in accordance with the breadth of each type, and means for producing by such light images of the individual types on the sensitive surface.

7. In a machine of the character described in combination, a plurality of stationary type templets, means for imparting to a surface sensitive to light a continuous uniform motion relatively to the said templets, electrical means associated with each templet for instantaneously throwing light through the same at intervals varying in accordance with the breadth of each type, and

means for producing by such light images of the individual types on the sensitive surface.

8. In a machine of the charac in combination, a plura -type templets. means for .iifor n a surface sensitive to light relat said templets, means for sele light through the said producing by such iii vidual types on the sens onary to tlf; crowing means for of the indisurface, and

register band controlled means for so 'regu-f a surface sensitive to light relatively to the said templets, electrical means associated with each templet for instantaneously throwing light through any one of the same, means for producing by such light an image of the said type on the sensitive sur'face, and register band controlled means for so regulating the light throwing means as to produce said images on the said surface at intervals varying in accordance with the breadth of each type.

10; In a machine of the character described in combination, a plurality of stationary type templets, means for moving a surface sensitive to light relatively to said templets, means for selectively throwing light through said templets, means'for producing by such light images of the individual templets on the sensitive surface; and a register band provided with longitudinal registering per-' forations disposed'at intervals varying in accordance with the breadth of each type, means for longitudinally moving the band in harmony with the movement of the sensitive surface, and means to engagethe band along the perforations thereof for control-.

ling said light throwing means.

11. In amachine of the character described in combination, a plurality of stationary type'templets, means for movin a surface sensitive to light relatively to sald templets, electrical means associated with each templet for instantaneously throwing light through the same, means for producing by such light an image of the said type on the sensitive surface; and a register band provided with longitudinal registering perforations disposed at intervals varying in accordance with the breadth of each type,

'means for longitudinally: moving the band.

in harmonywith the movement of the sensitive surface and means to eng-a e the'band along the perforations thereof or, controlling said light throwing means.

12. In a machine of the character described in combination, a plurality of stationary type templets, a paper carriage carrying a sensitive surface, means for lmparting to i said carriage continuous uniform motion relatively to said templets, electrical means associated with each templet for instantane= ously thowing light through the same, means for producing by such light an image of the said typeon the sensitive surface, register.

band controlled means for controlling said electrical means, and means for operatively connecting the carriage to move in harmony with said register band.

13. In a machine of the character described in combination, a pluralit of stationary type templets, each consisting of a photographic reproduction of a type, means for moving a surface sensitive to light relatively to said templets, means for selectively throwing light through the said temp ets and means for producing by such light images of said types on the sensitive surface.

14. In a machine of the character described in combination, a plurality of stationary type templets, means for imparting to a surface sensitive tolight a uniform continuous motion relatively to the said templets, a

source of light and a condensing lens behind each templet, and means arranged in front of said templets for throwing the light emitted from said sources of light upon the said sensitive surface.

15. In amachine'of the character described in combination, a plurality of stationary type templets,'means for imparting to a surface sensitive to light a uniform continuous of light upon t e said sensitive surface.

16. In a machine of the character described in combination, a plurality of stationary type templets, means for imparting to a surface sensitive to light a uniform continuous motion relatively to the said templets, a source of light and a condensing lens be: hind each templet and condensing lenses and prisms arranged in front of said templets for throwing the light upon the said sensitive surface.

WILHELM VON SIEMENS. 

